<template>
  <div>
    <!--面包屑导航-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片效果-->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!--表格-->
      <tree-table
        class="tree-table"
        border
        :data="catelist"
        index-text="#"
        :show-index="true"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        :show-row-hover="false"
      >
        <!--是否有效-->
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            v-if="scope.row.cat_deleted === false"
            style="color:lightgreen;"
          ></i>
          <i class="el-icon-error" v-else></i>
        </template>
        <!--排序-->
        <template v-slot:order="scope">
          <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
          <el-tag size="mini" v-else-if="scope.row.cat_level===1" type="success">二级</el-tag>
          <el-tag size="mini" v-else type="warning">三级</el-tag>
        </template>
        <!--操作-->
        <template v-slot:opt>
          <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
          <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
        </template>
      </tree-table>
      <!--分页区域-->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="3"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      ></el-pagination>
    </el-card>
    <!--添加分类-->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="ruleForm"
        class="demo-ruleForm"
        label-width="100px"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChange"
            clearable
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data () {
    return {
      // 商品分类数据列表
      catelist: [],
      // 查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 3
      },
      // 总数据条数
      total: 0,
      // 为table指定列的定义
      columns: [
        {
          label: '分类',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      // 是否显示添加分类对话框
      addCateDialogVisible: false,
      // 添加分类表单
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ],
        cat_pid: []
      },
      // 父级分类的列表
      parentCateList: [],
      // 指定级联选择器的配置对象
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 选中的父级分类id数组
      selectedKeys: []
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories', {
        params: this.queryInfo
      })
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.catelist = res.data.result
      this.total = res.data.total
    },
    // 监听页面显示数据条数变动事件
    handleSizeChange (newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听当前页码发生变化
    handleCurrentChange (newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    showAddCateDialog () {
      this.addCateDialogVisible = true
      this.getParentCateList()
    },
    async getParentCateList () {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 }
      })
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.parentCateList = res.data
    },
    // 级联选择触发改变
    parentCateChange () {
      if (this.selectedKeys.length > 0) { // 选中了父级分类
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    // 点击按钮，添加新分类
    addCate () {
      this.$refs.ruleForm.validate(async valid => {
        if (!valid) {
          return
        }
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error(res.meta.msg)
        }
        this.getCateList()
        this.addCateDialogVisible = false
        return this.$message.success('添加分类成功')
      })
    },
    // 监听对话框的关闭事件
    addCateDialogClosed () {
      this.$refs.ruleForm.resetFields()
      this.addCateForm.cat_pid = 0
      this.addCateForm.cat_level = 0
      this.selectedKeys = []
    }
  }
}
</script>
<style lang="less" scoped>
.tree-table {
  margin-top: 15px;
}
.el-cascader{
    width: 100%;
}
</style>
